CN104109528A - Acidifying liquid capable of sand stabilization and plug removal, and preparation method thereof - Google Patents
Acidifying liquid capable of sand stabilization and plug removal, and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an acidifying liquid capable of sand stabilization and plug removal and a preparation method thereof, which belongs to the technical field of oil exploitation. The acidifying liquid comprises, by weight, 6 to 15% of hydrochloric acid, 3 to 10% of fluorboric acid, 0.5 to 5% of hydrofluoric acid, 0.5 to 5% of an anti-swelling agent, 0.5 to 5% of an IS-130 corrosion inhibitor, 0.5 to 5% of an SCA iron ion stabilizing agent, 0.5 to 5% of an XT-05 cleanup additive, 0.5 to 5% of glycol monobutyl ether and 5 to 15% of an XT-23 sand control stabilizing agent, with the balance being water. The acidifying liquid is mainly used for strata with loose sandstone reservoirs, can remove inorganic obstruction of strata, forms a bonding covering on points and surfaces where silty-fine sandstone contacts with clay particles, strengthens skeleton gravels, inhibits migration of particles and reduces damage to reservoirs caused by formation sand production and particle migration obstruction due to loosening of a rock skeleton during various operations of an oil-water well; thus, the effective period of each measure is prolonged, construction procedures are simplified, operation cost is reduced, and the comprehensive effects of exploitation of oil reservoirs in loose sandstone are improved.
Description
Technical field
The present invention is specifically related to a kind of steady sand Breakdown acidizing liquid for understressed sand reservoir and preparation method thereof, belongs to technical field of petroleum extraction.
Background technology
In oil development production process, the understressed sand reservoir that some reservoir characteristics are good pollutes obstruction through exploitation all the year round and frequent borehole operation meeting, often take acidification to dispel block, but conventional acidifying destroys seriously ma, very easily causes sand production.In addition,, at mid-late oilfield development, long-term injecting water or gas injecting mining and the acidifying of many rounds have also destroyed reservoir skeleton greatly, cause oil and water well to shake out.Some oil field due to reservoir mainly take argillaceous agglutination as main ma loose, after long-term injecting water and acidifying measure, formation cementation composition runs off ma is destroyed, and causes particle migration and stops up stratum, the phenomenon of shaking out is serious.The harm of sand production is mainly manifested in three aspects: the one, and sand buries payzone, causes oil well reduce or stop production; The 2nd, sand grains at a high speed, causes ground and underground equipment aggravation abrasion; The 3rd, shake out and cause stratum in debt and cave in, cause casing failure that oil well is scrapped etc.
At present, for the acidifying sand control technique of loose sand oil accumulation or high shale sand production petroleum reservoir, mostly adopt the technique of " first sour rear defence " or " first anti-rear acid ", although these techniques have obtained certain effect, still not fully up to expectations in the long run.As the destruction that acidifying in advance easily causes ma, aggravation formation sand production, causes final sand-proofing success ratio to reduce, sand control life shortens, and conventional acidifying causes stratum fine particles migration, easily causes the obstruction of immediate vicinity of wellbore and sand block layer, affects oil well productivity and intensified injection of wells.Although relevant sand stabilization agent formula has been studied in some oil fields, be to adopt high polymer polyacrylamide and linking agent mostly, not only poor with the compatibleness of acid solution, and also field test results is bad.
Patent (publication number: CN 101067078A) disclose a kind of sandstone matrix acidifying solution, by organic multicomponent phosphono and sulfonic, ammonium bifluoride, phosphonic acids inhibiter, NTS-2 Fe stabilizer, JS-7 clay stabilizer, ethylene glycol monobutyl ether, XBS-919 cleanup additive and water, formed, Main Function is slowly, accretion distance, be a kind of typical retarded acid, but have numerous deficiencies for the acidifying sand control technique of loose sand oil accumulation or high shale sand production petroleum reservoir.Therefore, a kind of steady sand Breakdown acidizing liquid with de-plugging, steady sand effect urgently.
Summary of the invention
The object of this invention is to provide a kind of steady sand Breakdown acidizing liquid.
Meanwhile, the present invention also provides a kind of preparation method of steady sand Breakdown acidizing liquid.
In order to realize above object, the technical solution adopted in the present invention is:
A kind of steady sand Breakdown acidizing liquid, component by following weight percentage forms: hydrochloric acid 6～15%, fluoroboric acid 3～10%, hydrofluoric acid 0.5～5%, expansion-resisting agent 0.5～5%, IS-130 inhibiter 0.5～5%, SCA Fe stabilizer 0.5～5%, XT-05 cleanup additive 0.5～5%, ethylene glycol monobutyl ether 0.5～5%, XT-23 presses down sand stablizer 5～15%, and surplus is water.
Described expansion-resisting agent is the mixture of the one or both in JS-7 clay stabilizer, ammonium chloride, and Main Function is to prevent clay swelling.
Described IS-130 inhibiter is condensed-nuclei aromatics quaternary ammonium salt, can delay the corrosion speed of acid solution to tubing string and instrument, protection preparation of construction.
Described SCA Fe stabilizer is comprised of iron-retention agent and iron reducer etc., can delay iron gel precipitation in acidization, prevents secondary injury.
Described XT-05 cleanup additive is polyvalent alcohol nonionic surface active agent, can reduce the surface tension between acid solution and reservoir, is beneficial to that acid solution enters reservoir and row is returned in residual acid.
It is to take MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride (DMC) as main cationic polymers that described XT-23 presses down sand stablizer, can be by the hydrogen bond bridge joint of amide group and loose sand grain surface hydroxyl, further strengthen the effect of control sand, preventing formation sand production, is the keying action composition of this steady sand Breakdown acidizing liquid.
Preferably, a steady sand Breakdown acidizing liquid, is comprised of the component of following weight percentage: hydrochloric acid 12～15%, fluoroboric acid 3～10%, hydrofluoric acid 2～5%, expansion-resisting agent 1～3%, IS-130 inhibiter 2～3%, SCA Fe stabilizer 2～3%, XT-05 cleanup additive 1～3%, ethylene glycol monobutyl ether 2～3%, XT-23 presses down sand stablizer 8～12%, and surplus is water.
A kind of preparation method of steady sand Breakdown acidizing liquid, step is as follows: according to formula ratio, accurately get each component, hydrochloric acid, fluoroboric acid and hydrofluoric acid are dissolved in part water, stir, add ethylene glycol monobutyl ether, after stirring evenly, add IS-130 inhibiter, SCA Fe stabilizer, XT-05 cleanup additive and expansion-resisting agent, after stirring evenly, add again XT-23 to press down sand stablizer and excess water, stir evenly and get final product.
Described expansion-resisting agent is the mixture of the one or both in JS-7 clay stabilizer, ammonium chloride.
Beneficial effect of the present invention:
Steady sand Breakdown acidizing liquid in the present invention is mainly used in the stratum of understressed sand reservoir, not only can remove the inorganic obstruction in stratum, can also be at powder packsand and small bits of clay point of contact and surface formation bonding coverture, consolidate skeleton gravel, suppress fine migration, reduce oil and water well injury to reservoir because of the loose formation sand production causing of ma and fine migration obstruction in various measure operation process, thereby extend measure validity period, in steady sand, can also prevent that bottom from shaking out, be a kind of steady sand acid.Use this steady sand Breakdown acidizing liquid once to construct can to realize the multinomial technology such as de-plugging, sand control, steady sand integrated, can effectively simplify working procedure, reduce operating cost, improve the net effect of loose sand oil accumulation exploitation.
In active principle in the present invention, expansion-resisting agent, IS-130 inhibiter, SCA Fe stabilizer, XT-05 cleanup additive and ethylene glycol monobutyl ether compatibleness under normality or acidic conditions is good, and stable performance, effect are without weakening.Wherein, XT-23 press down sand stablizer must its each composition under acidic conditions could and DMC polymer between react and form high-density cation polyelectrolyte system, reach steady sand effect, especially obvious with the synergistic action effect of fluoroboric acid.
In the present invention, the optimum amount of steady sand Breakdown acidizing liquid is every rice bran oil layer 2-3 side, clamp-on reservoir after closing well reaction within 2 hours, be advisable, reaction finishes rear cooperation gaslift flowback effect can be better.This steady sand Breakdown acidizing liquid can reach 106.5% to the mean permeability recovery rate of oil field loose sand oil accumulation core reforming test, and the test of improved resistance to erosion can guarantee steady sand effect under the discharge capacity of 6mL/min.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but does not form any limitation of the invention.
Embodiment 1
Steady sand Breakdown acidizing liquid in the present embodiment is comprised of the component of following weight percentage: hydrochloric acid 6%, fluoroboric acid 3%, hydrofluoric acid 0.5%, JS-7 clay stabilizer 0.5%, IS-130 inhibiter 0.5%, SCA Fe stabilizer 0.5%, XT-05 cleanup additive 0.5%, ethylene glycol monobutyl ether 0.5%, XT-23 presses down sand stablizer 5%, and surplus is water.
The preparation process of the steady sand Breakdown acidizing of the present embodiment liquid is as follows: according to formula ratio, accurately get each component, hydrochloric acid, fluoroboric acid and hydrofluoric acid are dissolved in part water, stir, add ethylene glycol monobutyl ether, after stirring evenly, add IS-130 inhibiter and SCA Fe stabilizer, stir evenly, then add XT-05 cleanup additive and JS-7 clay stabilizer, after stirring evenly, add XT-23 to press down sand stablizer and excess water, stir evenly and get final product.
Embodiment 2
Steady sand Breakdown acidizing liquid in the present embodiment is comprised of the component of following weight percentage: hydrochloric acid 10%, fluoroboric acid 5%, hydrofluoric acid 3%, ammonium chloride 1%, IS-130 inhibiter 2%, SCA Fe stabilizer 2%, XT-05 cleanup additive 2%, ethylene glycol monobutyl ether 2%, XT-23 presses down sand stablizer 8%, and surplus is water.
The preparation process of the steady sand Breakdown acidizing of the present embodiment liquid is as follows: according to formula ratio, accurately get each component, hydrochloric acid, fluoroboric acid and hydrofluoric acid are dissolved in part water, stir, add ethylene glycol monobutyl ether, after stirring evenly, add IS-130 inhibiter and SCA Fe stabilizer, stir evenly, then add XT-05 cleanup additive and ammonium chloride, after stirring evenly, add XT-23 to press down sand stablizer and excess water, stir evenly and get final product.
Embodiment 3
Steady sand Breakdown acidizing liquid in the present embodiment is comprised of the component of following weight percentage: hydrochloric acid 12%, fluoroboric acid 3%, hydrofluoric acid 2%, JS-7 clay stabilizer 2%, IS-130 inhibiter 2%, SCA Fe stabilizer 2%, XT-05 cleanup additive 3%, ethylene glycol monobutyl ether 3%, XT-23 presses down sand stablizer 10%, and surplus is water.
The preparation process of the steady sand Breakdown acidizing of the present embodiment liquid is as follows: according to formula ratio, accurately get each component, hydrochloric acid, fluoroboric acid and hydrofluoric acid are dissolved in part water, stir, add ethylene glycol monobutyl ether, after stirring evenly, add IS-130 inhibiter and SCA Fe stabilizer, stir evenly, then add XT-05 cleanup additive and JS-7 clay stabilizer, after stirring evenly, add XT-23 to press down sand stablizer and excess water, stir evenly and get final product.
Embodiment 4
Steady sand Breakdown acidizing liquid in the present embodiment is comprised of the component of following weight percentage: hydrochloric acid 12%, fluoroboric acid 8%, hydrofluoric acid 3%, JS-7 clay stabilizer 1%, ammonium chloride 3%, IS-130 inhibiter 3%, SCA Fe stabilizer 3%, XT-05 cleanup additive 3%, ethylene glycol monobutyl ether 3%, XT-23 presses down sand stablizer 12%, and surplus is water.
The preparation process of the steady sand Breakdown acidizing of the present embodiment liquid is as follows: according to formula ratio, accurately get each component, hydrochloric acid, fluoroboric acid and hydrofluoric acid are dissolved in part water, stir, add ethylene glycol monobutyl ether, after stirring evenly, add IS-130 inhibiter and SCA Fe stabilizer, stir evenly, then add XT-05 cleanup additive, JS-7 clay stabilizer and ammonium chloride, after stirring evenly, add XT-23 to press down sand stablizer and excess water, stir evenly and get final product.
Embodiment 5
Steady sand Breakdown acidizing liquid in the present embodiment is comprised of the component of following weight percentage: hydrochloric acid 15%, fluoroboric acid 10%, hydrofluoric acid 5%, JS-7 clay stabilizer 5%, IS-130 inhibiter 5%, SCA Fe stabilizer 5%, XT-05 cleanup additive 5%, ethylene glycol monobutyl ether 5%, XT-23 presses down sand stablizer 15%, and surplus is water.
The preparation process of the steady sand Breakdown acidizing of the present embodiment liquid is as follows: according to formula ratio, accurately get each component, hydrochloric acid, fluoroboric acid and hydrofluoric acid are dissolved in part water, stir, add ethylene glycol monobutyl ether, after stirring evenly, add IS-130 inhibiter and SCA Fe stabilizer, stir evenly, then add XT-05 cleanup additive and JS-7 clay stabilizer, after stirring evenly, add XT-23 to press down sand stablizer and excess water, stir evenly and get final product.
The raw material relating in embodiment 1～5 is commercially available prod, wherein hydrochloric acid, fluoroboric acid, hydrofluoric acid all can adopt industrial goods, press down sand stablizer XT-23, cleanup additive XT-05, Fe stabilizer SCA, inhibiter IS-130 and clay stabilizer JS-7 and are the industrial goods that Xinxiang City Xuan Tai Industrial Co., Ltd. sells.
Test example
Acidizing fluid Lab-evaluation experiment of the present invention below:
1,, under reservoir temperature, first use 2%NH
4cL solution is surveyed core benchmark rate of permeation K
1; Then with the return water of joint station, inject core, simulated field water filling, observation test drill core permeability rate changing conditions; When drill core permeability rate declines and has after a stationary value, the acidizing fluid of preparing by the embodiment of the present application carries out de-plugging, with constant discharge, injects 3～5PV; React and use again 2%NH after two hours
4cL solution is surveyed drill core permeability rate K
2; According to drill core permeability rate value before and after experiment, by following formula, calculate drill core permeability rate recovery rate A:
A=K
2/K
1×100%
Experimental result is in Table 1.
Table 1 drill core permeability rate recovery rate experimental result
| Core numbering | Embodiment | Original infiltration (mD) | Infiltration (mD) after acidifying | Core recovers (%) |
| V2-2 | 1 | 144.53 | 146.48 | 101.35 |
| V1 | 2 | 108.32 | 108.38 | 100.06 |
| V25 | 3 | 114.81 | 121.56 | 105.9 |
| V33 | 4 | 71.65 | 76.76 | 107.13 |
| V34 | 5 | 163.21 | 192.68 | 118.06 |
2, in order further to check the steady grittiness energy of this acidizing fluid, choosing artificial cores permeability range is 300～350mD, under reservoir temperature, with constant discharge, by the order of " benchmark liquid → steady sand Breakdown acidizing liquid → termination of pumping reaction 2 hours ", carry out fluid injection test, after reaction finishes, basket is carried out to the experiment of displacement clear water by different displacements, the observation situation of shaking out, test-results is in Table 2.
The table 2 core barrel situation of shaking out
From the experimental results, along with the increase of discharge capacity, artificial cores does not all shake out, and shows that acidizing fluid prepared by the embodiment of the present application has preferably steady grittiness energy.Attached constant-flux pump is tested the reduction formula that is related to of discharge capacity and actual water injection rate:
Q in formula: actual water injection rate, m
3/ d; H: effective pay thickiness, m; r
w: well radius: 12cm; Qc: experiment flow velocity, mL/min; D: core diameter: 2.54cm;
Conventionally the water injection intensity of well is generally at 5～10m
3/ dm, calculates accordingly, and when indoor constant-flux pump discharge capacity is 1～5mL/min, the value of Q/h is: 2.15～10.71m
3/ dm, meets field condition requirement.
3, in order further to contrast the steady grittiness energy of this acidizing fluid, choosing artificial cores permeability range is 300～350mD, under reservoir temperature, with constant discharge, by the order of " XT-23 under the nonacid condition of benchmark liquid → 15% presses down sand stabiliser solution → termination of pumping reaction 2 hours ", carry out fluid injection test, after reaction finishes, basket is carried out to the experiment of displacement clear water by different displacements, the observation situation of shaking out, test-results is in Table 3.
XT-23 under the nonacid condition of table 3 presses down the steady grittiness energy of sand stabiliser solution experimental result
From the experimental results, the XT-23 under nonacid condition presses down the steady sand poor performance of sand stabiliser solution.
Test example 1
Certain water injection well, is divided into II 14
2, 15
1.2, 18
2/ III 21,24
1.2.3/ III 26
1.2three sections of water fillings of secondary.Injection allocation is: 20/15/15m
3/ d, each section of water nozzle is: sky/sky/sky, at pump pressure 25MPa, under oil pressure 24.8MPa, real note is 10/0/0m
3/ d.Under high-pressure system, only has II 14
2, 15
1.2, 18
2layer water suction.This well from calendar year 2001 so far, lived through 4 acidifyings, acidizing effect is variation gradually, after acidifying, validity period only has 1 month for the first time, has reached for the second time injection allocation requirement after acidifying, but that water injection rate declines is fast, validity period is shorter.Data analysis think this well acidizing effect poor be mainly to shake out and fine migration after Reservoir Acidization, stop up due to the reasons such as stratum, conventional acidifying measure is difficult to meet the needs of acidifying and steady sand.Finally, adopt the steady sand Breakdown acidizing liquid of the embodiment of the present application 5 preparations to carry out acidifying rebuilding construction to this well.With water filling situation contrast after acidizing treatment in the past, water injection pressure declines to a great extent, and after construction, at water filling oil pressure 20MPa, is issued to injection allocation, has seen good step-down augmented injection effect.Water filling validity period surpasses 9 months now, and the requirement that has realized preferably the augmented injection of understressed sand acidification to dispel block and steady sand is described.
Test example 2
Certain producing well, goes into operation for 2008, and perforation layer position is H3 II 4
2-3layer.Day at initial stage production fluid 16t, moisture 8%, working fluid level is 974m.This well shakes out more serious, and production fluid situation is always poor, during repeatedly operation acidifying and well-flushing, but daily fluid production rate is always in 3-4t left and right.From formation condition, this well payzone deposit thickness is larger, formation porosity 23.81-24.60%, rate of permeation 0.971-1.083um
2, shale index 2.66-3.09%, should have certain liquid-producing capacity, thus think this well go into operation after production fluid poor be due near pit shaft, shake out serious due to.Adopt the steady sand Breakdown acidizing liquid of embodiment 4 preparations to carry out acidifying rebuilding construction to this well, after closing well reaction, adopt nitrogen to return the residual acid of row.After operation, produce oil rises to 15t this well day, moisture 10%, and working fluid level is 950m, is valid up to 450 days, and accumulative total increases 4500 tons of oil.By operation, observe, do not find the serious phenomenon of shaking out, show that this steady sand Breakdown acidizing liquid has played de-plugging, steady sand effect to reservoir.
Claims (5)
1. a steady sand Breakdown acidizing liquid, it is characterized in that: the component by following weight percentage forms: hydrochloric acid 6～15%, fluoroboric acid 3～10%, hydrofluoric acid 0.5～5%, expansion-resisting agent 0.5～5%, IS-130 inhibiter 0.5～5%, SCA Fe stabilizer 0.5～5%, XT-05 cleanup additive 0.5～5%, ethylene glycol monobutyl ether 0.5～5%, XT-23 presses down sand stablizer 5～15%, and surplus is water.
2. steady sand Breakdown acidizing liquid according to claim 1, it is characterized in that: the component by following weight percentage forms: hydrochloric acid 12～15%, fluoroboric acid 3～10%, hydrofluoric acid 2～5%, expansion-resisting agent 1～3%, IS-130 inhibiter 2～3%, SCA Fe stabilizer 2～3%, XT-05 cleanup additive 1～3%, ethylene glycol monobutyl ether 2～3%, XT-23 presses down sand stablizer 8～12%, and surplus is water.
3. steady sand Breakdown acidizing liquid according to claim 1 and 2, is characterized in that: described expansion-resisting agent is the mixture of the one or both in JS-7 clay stabilizer, ammonium chloride.
4. the preparation method of a steady sand Breakdown acidizing liquid as claimed in claim 1 or 2, it is characterized in that: step is as follows: according to formula ratio, accurately get each component, hydrochloric acid, fluoroboric acid and hydrofluoric acid are dissolved in part water, stir, add ethylene glycol monobutyl ether, after stirring evenly, add IS-130 inhibiter, SCA Fe stabilizer, XT-05 cleanup additive and expansion-resisting agent, after stirring evenly, add again XT-23 to press down sand stablizer and excess water, stir evenly and get final product.
5. the preparation method of steady sand Breakdown acidizing liquid according to claim 4, is characterized in that: described expansion-resisting agent is the mixture of the one or both in JS-7 clay stabilizer, ammonium chloride.
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